How does the U2412 compare to the HP ZR24 (S-IPS, 7ms g-g, 400 cd/2) which seems to retail around $400, and the newer ZR2440 (6ms g-g, 350 cd/2, LED backlit but doesn't specify type of IPS) at the same or a little lower price. Both are 1920x1200, 24" screens.

I presume the 2440 will have a narrower colour gamut in exchange for the LED and greatly improved efficiency, but is it the same panel type as the U2412M?